ColdFusion 9 memory question

HI All-

Sorry for the newbie admin question:

I  just got a brand new Windows Server 2008 R2 Standard server (Intel Xeon  2.13ghz) server with 8 GB RAM. CF 9 64 bit is installed with IIS 7.5,  MySQL (also 64 bit).

How much RAM will the Java HotSpot server that ColdFusion installed be able to use? (I verified that it's the 64 bit version).

I've  read some articles about how I shouldn't automatically just increase  memory allocation, is there a basic rule to apply RAM for system use? Any articles on exactly how to do this?

Again, my apologies for the beginner questions.

Thanks in advance,

Rich